Swaziland: new infections halved in five years as HIV treatment scales up

New HIV infections have halved
in Swaziland since 2011 at the same time as the proportion of people on
antiretroviral treatment with fully suppressed viral load has doubled, the
9th International AIDS Society Conference on HIV Science (IAS 2017) heard in Paris, France, today. It
is the first direct evidence that expanding HIV treatment results in fewer HIV
infections in a country with a major epidemic, researchers said.

The study “shows that our
efforts can pay off and is a proof of concept”, said Professor Linda
Gail-Bekker, President of the International AIDS Society.

Conference Co-Chair
Jean-Francois Delfraissy described the results as “fantastic” and the audience
at this morning’s presentation greeted the findings with prolonged applause.

Although the effect of HIV
treatment on stopping HIV transmission is well established at the individual or
couple level, the impact of wider uptake of treatment on HIV transmission at
the population level is less well understood. Research
in Kwazulu-Natal province, South Africa, has shown that an increase in HIV
treatment coverage is associated with a fall in HIV incidence. What has been
lacking, until now, is evidence that increasing the proportion of people living with
HIV who have fully suppressed viral load is associated with a decline in new
HIV infections.

The Kingdom of Swaziland has one
of the most severe HIV epidemics in the world. In a country with a population
of 1.45 million, just under a third (32%) were estimated to be living with HIV
in 2011, when the country conducted its first door-to-door HIV testing exercise.

Since 2011, Swaziland has scaled up access to
antiretroviral treatment and testing, adopting the 'treat all' approach
recommended by the World Health Organization and enabling nurses to start
people on antiretroviral treatment to speed up treatment initiation. The number
of HIV tests carried out each year has almost tripled since 2011 and the number
of men who have undergone medical circumcision has more than doubled. The number
of people on antiretroviral treatment grew from 72,402 in 2011 to 171,266 in
2016.

The 2011 survey tested 18,172
people aged 15 years and over, sampled through home-based testing. The survey
found an HIV prevalence of 24.1% in men and 38.8% in women, and found that 1.8%
of men and 3.16% of women had acquired HIV within the previous 120 days. At
this time, 34.8% of people living with HIV had a suppressed viral load.

A second survey was carried out
in 2016-17 to look at whether HIV incidence had risen, stayed the same or
declined and to find out what proportion of people with HIV had a suppressed
viral load. Clinic records may not show all people living with HIV because a
proportion might be lost to follow-up, or because viral load testing is not
available, so a door-to-door sampling of viral load gives a more accurate
picture of how many people living with HIV are on fully effective treatment and cannot pass on HIV to sexual partners.

The 2016 survey selected 286
districts at random and 6417 households within those districts for offers of
testing. Household members aged 15 and
over who consented to testing received an HIV antibody test and a point-of-care
CD4 test.

All samples testing positive for
HIV antibodies were tested for HIV RNA and HIV antigen at a central laboratory,
to identify recent infections. Both surveys used an assay which is designed to
recognise HIV antigen produced in the first four months (130 days) after
infection, a limiting antigen avidity assay.

A total of 10,934
people over the age of 15 were tested. Eighty-four per cent of households took part, and
92% of men and 95% of women agreed to be tested. The survey found no
significant change in HIV prevalence in women or men (38.1 and 21.2%
respectively), but a significant reduction in new HIV infections. In men, HIV
incidence fell by 53%, from 1.83 to 0.86%. In women, HIV incidence fell by
38%, from 3.16 to 1.95%. Overall, HIV incidence fell by 44% (p = 0.012).

Viral load suppression doubled
between 2011 and 2016-17, from 34.8 to 71.3%.

The survey found that more women
knew their HIV status than men (88.6 vs 77.5%), but there was no substantive
difference in the proportions of men and women on treatment (87.4% overall) and
virally suppressed (91.9% overall).

People over 25 years of age were
more likely to know their HIV status, to be on treatment and to be virally
suppressed, consistent with findings from many other African countries.
Presenting the results, Velephi Okello of the Kingdom of Swaziland Ministry of
Health said that further efforts to engage men and young people were needed to
achieve the 90-90-90 target.

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The Community Consensus Statement is a joint initiative of AVAC, EATG, MSMGF, GNP+, HIV i-Base, the International HIV/AIDS Alliance, ITPC and NAM/aidsmap

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NAM’s information is intended to support, rather than replace, consultation with a healthcare professional. Talk to your doctor or another member
of your healthcare team for advice tailored to your situation.